<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }

      .page {
        display: grid;
        grid-template-columns: 200px 1fr 200px;
        height: 200px;
      }

      .left,
      .right,
      .content {
        height: 200px;
      }

      .content {
        background-color: #e0c230;
        grid-column: 2 / 3;
      }
      .left {
        background-color: #1adc20;
        grid-column: 1 / 2;
        grid-row: 1 / 2;
      }
      .right {
        background-color: #1adc20;
        grid-column: 3 / 4;
        grid-row: 1 / 2;
      }
    </style>
  </head>
  <body>
    <div class="page">
      <div class="content">主要内容</div>
      <div class="left">广告位</div>
      <div class="right">广告位</div>
    </div>
  </body>
</html>
